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1. Introduction

At present, soybean/sunflower/rice bran/corn germ/peanu/rapeseed/canola/cottonseed cooking oil production process have two kind of processing method: pressing and leaching(extraction). Pressing method is by physical pressure and get oil directly from the oil seeds. The whole process does not involve any chemical additives, to ensure product safety, health, pollution-free. The expeller method is divided into cold pressing and hot pressing. The difference of cold pressing and hot pressing is whether use high-temperature process or not. Hot pressing using a high temperature, can improve the oil yield, but destroy nutrients; cold-pressed not to use high temperature, the oil is low, but the complete nutritional ingredients.

1..1 Here have some example of hot pressing and cold pressing method.

1.1.1 Process and methods of seeds pressing.

There are two ways of pressing of special seeds: cold press and hot press.

(3) Introduction of process: Will screen soybean and cleaning soybean first, then crushing soybean and add 7-8% of water to soften the seeds, send soybean to cooker, steam until about 115°C, then will press seeds.

1.1.2 Process and method of rapeseed press:

The rapeseed have two ways of pressing, cold press and hot press. To improve the oil yield and oil quality, generally the hot press is used.

(1) Cold press:oil seeds---Screening---Squeezing---Steaming----Pressing, First, Screening the rapeseed and check the moisture content of rapeseed, if the rapeseed too dry, we need to add 2.5-3% water, later put the seeds into the expeller.

(2) Hot press: Rapeseed/vegetable seeds---Screening---Squeezing---Steaming----Pressing, Filter the rapeseed and remove the residue, and then enter the flaking machine for seeds flaking. After flaking, will go into the cooker for steaming and roasting, during steaming add 2-3% water, will start milling after the seeds become brown and the temperature is 110-120°C.

1.1.3 The process and method of peanut kernel pressing.

Hot press and cold press is suitable for peanut kernel, generally we use hot press. Hot pressing, the first crushing or flaking the peanut kernel, then placed in the steamer for 1.5-2 hours. When the cake’s temperature arrives 120°C and water content is 3%, will start normal squeezing.

Peanut----Cleaning---First milling---filter----Press two times---Crude oil----Refinery---Press third times---Crude oil after pressing----Filter----Cake after pressing.

1.1.4 Character of seeds press/mill/expeller machine

ZY-24 style

202-3style

200A-3style

Output capacity (t/d)

50-55(seed)

45-50

9-12

Residual oil %

11-13(cakes)

11-13

6-7

Motor(kw)

30,7.5,22

30

18.5

Weight (kg)

7500

6500

5000

Dimension(mm)

3060*1970*4500

2950*1950*3270

2850*1850*3270

2. The difference of pressing and extraction(leaching):

Squeezing method due to the yield is low, so the raw material for squeezing must be seeds of high oil content, and itself is probably oil crops; Due only to squeeze at the same time, the residual oil in the cake is high, so the modern enterprise in order to save resources, the pursuit of efficiency of cases will be to squeeze the oil cake with leaching rule of oil again

3. Introduction of solvent extraction line

The whole extraction workshop is selected on the base of safety, reliable, energy-saving, less fault, easy maintenance, and long using life, adopting world advanced technology and equipment to achieve the best process effect.

Process flow:

The material(for pretreatment) is sent to the extractor by the airtight packing auger. The mateiral will be sprayed for extraction by the solvent(Hexance) or mixed oil after they fall into the extractor. The wet dreg(after dripping), falling into the conveyor and be sent to the evapo-separated machine. After steaming, baking and desolventizing, the dreg will be sent to the dreg storehouse. Mixed oil after extraction enters into the first and second long tube evaporator for seperating the steam and solvent, and then flow into the stripping tower for desorption the remaining solvent of crude oil. The extracted oil from the last process will be sent into the crude oil tank for refining plant. The solvent vapors from the extractor, evapo-separated machine, evaporator, stripper tower will be recycled in the cooling system. The solvent after cooling will be collected in the fresh solvent tank for reusing in the process.

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